Displaying 20 results from an estimated 700 matches similar to: "Revert to R 3.2.x code of logicalSubscript in subscript.c?"
2017 Oct 01
0
Revert to R 3.2.x code of logicalSubscript in subscript.c?
Currently, in function 'logicalSubscript' in subscript.c, the case of no recycling is handled like the implentation of R function 'which'. It passes through the data only once, but uses more memory. It is since R 3.3.0. For the case of recycling, two passes are done, first to get number of elements in the result.
Also since R 3.3.0, function 'makeSubscript' in subscript.c
2017 Mar 07
0
length(unclass(x)) without unclass(x)?
> Henrik Bengtsson:
>
> I'm looking for a way to get the length of an object 'x' as given by
> base data type without dispatching on class.
The performance improvement you're looking for is implemented in the
latest version of pqR (pqR-2016-10-24, see pqR-project.org), along
with corresponding improvements in several other circumstances where
unclass(x) does not
2015 Sep 19
0
New version of the R parser in pqR
I have rewritten the R parser in the new version of pqR that I
recently released (pqR-2015-09-14, at pqR-project.org). The new
version of the parser is much cleaner, is faster (sometimes quite
substantially faster), has a better interface to the read-eval-print
loop, and provides a better basis for future extensions. The deparser
has also been substantially revised in pqR, and is better
2019 Feb 23
0
Bug: time complexity of substring is quadratic
> From: Tomas Kalibera <tomas.kalibera at gmail.com>
>
> Thanks for the report, I am working on a patch that will address this.
>
> I confirm there is a lot of potential for speedup. On my system,
>
> 'N=200000; x <- substring(paste(rep("A", N), collapse=""), 1:N, 1:N)'
>
> spends 96% time in checking if the string is ascii and 3%
2018 Sep 03
0
True length - length(unclass(x)) - without having to call unclass()?
Regarding the discussion of getting length(unclass(x)) without an
unclassed version of x being created...
There are already no copies done for length(unclass(x)) in pqR
(current version of 2017-06-09 at pqR-project.org, as well as the
soon-to-be-release new version). This is part of a more general
facility for avoiding copies from unclass in other circumstances as
well - eg,
2015 Jan 01
1
Unexpected behavior of debug() in step-wise mode
41;309;0c> Why does debug() enter Browse[3] here at all, and why does it happen the
> first time and not the second? This seems unexpected to me, and has
> undesirable effects for ESS users (that I reported here -
> https://stat.ethz.ch/pipermail/ess-help/2013-June/009154.html - but just
> realized my post to r-devel didn't make it through when I tried to report
> it back
2013 Apr 29
2
Adding elements in data.frame subsets and also subtracting an element from the rest elements in data.frame
Dear R forum
I have a data.frame as
cashflow_df = data.frame(instrument = c("ABC","ABC","ABC","ABC","ABC","ABC","ABC","ABC","ABC","ABC","ABC","ABC","ABC","ABC", "ABC", "PQR", "PQR",
2013 Jun 22
1
Announcing pqR - a faster version of R
I have released a new, faster, version of R, which I call pqR (for
"pretty quick" R), based on R-2.15.0. Among many other improvements,
pqR supports automatic use of multiple cores to perform numerical
computations in parallel with other numerical computations, and with
the interpretive thread. It also implements a true reference counting
scheme to reduce the amount of unnecessary
2018 Nov 27
1
Subsetting row in single column matrix drops names in resulting vector
Dmitriy Selivanov (selivanov.dmitriy at gmail.com) wrote:
> Consider following example:
>
> a = matrix(1:2, nrow = 2, dimnames = list(c("row1", "row2"), c("col1")))
> a[1, ]
> # 1
>
> It returns *unnamed* vector `1` where I would expect named vector. In fact
> it returns named vector when number of columns is > 1.
> Same issue applicable
2010 Feb 03
2
How to change output 'csv' file
Dear R helpers
After executing the R code, where the last few lines of the code are something like given below.
## Part of my R code
n = 20
........
.........
final_output = data.frame(Numbers = numbers, ABC = data1, XYZ = data2, PQR = data3)
write.csv(data.frame(Scenario = paste("Sc_", 1:n, sep = ""), final_output'), 'result.csv', row.names
2010 Feb 10
4
Readjusting the OUTPUT csv file
Dear R helpers
I have some variables say ABC, DEF, PQR, LMN and XYZ. I am choosing any three varaibles at random at a time for my analysis and name these files as input1.csv, input2.csv and input3.csv. So if I choose variables say ABC, DEF and PQR, I am passing the specifications of these variables to input1.csv, input2.csv and input3.csv respectively.
This means in another case even if I
2014 Jun 23
2
Unfixed bugs in latest R-patched
A new version of pqR is now available at pqR-project.org, which fixes
several bugs that are also present in the latest R Core patch release
(r66002). A number of bugs found previously during pqR development
are also unfixed in the latest R Core release. Here is the list of
these bugs that are unfixed in r66002 (including documentation
deficiencies), taken from the pqR bug fix and documentation
2013 Apr 26
2
Splitting data.frame and saving to csv files
Dear R Forum,
I have a data.frame as
df = data.frame(date = c("2013-04-15", "2013-04-14", "2013-04-13", "2013-04-12", "2013-04-11"),
ABC_f = c(62.80739769,81.04525895,84.65712455,12.78237251,57.61345256),
LMN_d = c(21.16794336,54.6580401,63.8923307,87.59880367,87.07693716),
XYZ_p = c(55.8885464,94.1358684,84.0089114,98.99746696,64.71083712),
2015 Aug 21
0
Problems with embedded R, ReplDLL
Along with getting pqR to work on Windows, I've also been testing it
in the context of embedded R, and in the process have found some
problems with the examples given of embedded R use.
One problem can be seen in R_ReplDLLinit, in src/main/main.c:
void R_ReplDLLinit(void)
{
SETJMP(R_Toplevel.cjmpbuf);
R_GlobalContext = R_ToplevelContext = R_SessionContext = &R_Toplevel;
2017 Jan 09
0
accelerating matrix multiply
> From: "Cohn, Robert S" <robert.s.cohn at intel.com>
>
> I am using R to multiply some large (30k x 30k double) matrices on a
> 64 core machine (xeon phi). I added some timers to
> src/main/array.c to see where the time is going. All of the time is
> being spent in the matprod function, most of that time is spent in
> dgemm. 15 seconds is in matprod in
2000 Jun 12
0
BACKUP SYSTEM WITH SAMBA
Dear Sirs.
I'm trying to make a Backup System using SAMBA.
The purpose is make backup of some directory of Windows 9x machines,
like Office Documents, E-mails directory, etc.
If I make one software that "select" and backup certain directories, it
will be good.
There are ~200 machines with Windows 9x, in 5 C class network:
1 - xyz.pqr.8.abc
2 - xyz.pqr.9.abc
3 - xyz.pqr.10.abc
4 -
2010 Feb 10
1
Converting pdb to pqr
There are websites using python to convert a pdb to a pqr. I was wondering if
there is a simpler way to do it. We have a protein in pdb format, and want
to convert that to a pqr file so that the program apbs can open it. We want
to accomplish this conversion in R. Thank you for your help.
--
View this message in context: http://n4.nabble.com/Converting-pdb-to-pqr-tp1475426p1475426.html
Sent
2010 Feb 10
3
Using R to format a file using a server (PDB to PQR file)
I am trying to write a program that uses R and takes a pdb file, and converts
it to a pqr file. This task is simple generally, using the website,
http://pdb2pqr-1.wustl.edu/pdb2pqr/. How do you use R to input a pdb file
(that is on hand) into the upload pdb file input, and run the website and
give the return file to be a pqr file. Thanks for your help.
--
View this message in context:
2014 Sep 07
0
New flag bit for serialized used by pqR
I will shortly be releasing a new version of pqR (you can get a test
version from pqR-project.org now - scroll to the bottom of the page).
One new feature in this version requires adding a bit to the flags
written out when data is serialized. I thought I'd let you know about
this so as to avoid any possible conflicts.
The new feature is that a few R objects are defined as constants,
which
2019 Feb 03
1
Inefficiency in df$col
While doing some performance testing with the new version of pqR (see
pqR-project.org), I've encountered an extreme, and quite unnecessary,
inefficiency in the current R Core implementation of R, which I think
you might want to correct.
The inefficiency is in access to columns of a data frame, as in
expressions such as df$col[i], which I think are very common (the
alternatives of